Expansion reamer



A. A.. |v| A EXPANSION ER.

APPLICATION FILED MAY 27; 1921.

1,428,391, Patenfasep. 5,1922; j y

, rameasept. 5,', 1922.'

UNITED STATES I PATENT OFFICE.

ANTHONY A.. MULAC, 0F ALLIANCE, OHIO, ASSIGNOB TO Tm-lBUCKEYE TWIST DREICOMPANY, A CORPORATION 0F OHIO.

To all whom t may concern:

Be it known that I, ANTHONY A. MULAC,

-a` citizen of the .United States, residin -at Alliance, in the count ofStark and tate of Ohio, have invente new and useful Improvements inExpansion Reamers, ofwhich the following is a s ecification.V

Theinvention re ates to reamers for cut-l tinfgpump and engine cylindersand-the like,

the object of the improvement. is to form the body of the reamer fron aninte gral cylindric block which may be expanded uniformly at all pointsin fits peri hery.

The invention is illustrated in t e 'accompanying drawings, Aformingparthereof, in which- Figure ll is a side elevation of the improvedreamer, secured-on' a stem- Fig. 2,-a detached end view ofthe reamer;and v Fig. .3, a lon' 'tudinal section ofthe reamer as on line I III,Fig. 2, showing the stem and blades in side elevation; Similarnumeralsrefer to-similar part throughoutthe drawings.A

The body.1 is made of a vcylindric block of resilient metal, which maybe chrome orI nickel steel. A series of longitudinal r ooves is providedin its periphery, in w ch; a

series of blades 3 are secured as by screws 4, and a longitudinalchannel 5 is referably provded in front of each blade, or recelvin thecuttings in the usual manner. I.

.or-conical sha .reamer, at each endv of which shank the 'stenrA isthreaded to receive nuts 9 and 9' by tapered -orconcal axial-bore 6 isprovided in the bod 'for receiving the tapered 7 of the stem '8f of thewhich the body of the reamer'may be adjusted endwise upon the shank.

An outer series of longitudinal bores 10 rovided in thebody, adjacent tothe thereof,ad van inner seriesl of each serles being preferably locatedin each section of the body between the successive blades, and the'outer and linner bores alternating with each other; as shown in Fig. 2

of the. drawings. D. l

`Agseries of longltudmal kel-fs 1 2 1s cut 1n bore to. the'longitu inalbores 10 of the outer l series; and a series of lon itudinal kerfs 13 iscut in thebody exten ing inward from the periphery to the' longitudinal.bores 11 of the inner series, the inner 'and' outer kerfs alternatingwith eachv other, and it isevi-4 dent that the body of the reamer may beexpanded by an endwise adjustment of the tapered shank in the axial borethereof.

A exin ofthe body around the bores at the one si e of the kerfs ispermitted by an opening of the other side of the kerfs, when the taperedshankI of the stem is adjusted in one direction, andl the resilience ofthe metal in the bod will contract it when 'the shank is adjuste in theother direction.

The longitudinal 'bores at the bottom of the kerfs are not essential,but they are pre the expansion and contraction of the body 1 .will beuniform end to end and throughout its periphery. This result followsfrom the accordion like action of expansion and contraction given by thealternate arrangement of. the kerfs. I claim 1. A reamerl including acylndric body having -an, axial bore, a series of vkerfs ex tendingoutwardl from the axial bore -part way to the periphery and a seriesofkerfs 'extending inward from the periphery part way to the axialbore,1the kerfs of oneseries alternating with the'kerfs of the otherseries,

and means vfor expanding the body. by an' opening of the kerfs.

v 2. A re'amer including a cylindric bodfv havin .a tapered axialbore, aseries of ker exten in l outward from the axial bore part way to te'periphery and a'series of kerfs extending inward ,from the peripherypart way yto the axial bore, the kerfs of one series alternating withthe kerfs of the other series, and a tapered shankadjustable endwise'inthe axi al bore.

`3. A reamer including a cylindric body' vhaving an axial bore, an outerseries of longitudinal bores adjacent to the periphery -and an innerseries of lon 'tudinal bores adjacent to thexal bore a tel-Dating with Qmensen the bores of the outer series, a. seriesr of kerfs extending.from the axial bore to vthe bores of theouter series, and a. series ofkerfs extending from the periphery to the' bores 5 of the inner series,andl means for expanding the bod by e exion thereof around the longituinni bores.,

` ANTHoNY AMULA-e.

